516 results about "Throttle opening" patented technology

The invention discloses a predictive cruise control method and system for a commercial vehicle. The method comprises the steps that road gradient information provided by a high-precision map and a target cruise vehicle speed corrected by a deep belief network driving style model are obtained to serve as input parameters; according to the rotating speed and the torque of the engine, a weighted moving average algorithm is adopted to carry out averaging processing on the power value within a short period of time, and the current engine power is generated; on the basis of an automobile power balance equation, according to the current position and the slope value of the front road, the driving power requirement of the next slope section is predicted; and in combination with the efficient output power interval of the engine, the recommended gear and the optimal accelerator opening degree of the next slope section are generated according to different power demand conditions. Therefore, according to the predictive cruise control method for the commercial vehicle, the gears and the accelerator can be adjusted in a self-adaptive mode according to the road gradient and the driving habit, the driving efficiency and the fuel economy are improved, and the individuation of the driving experience is enhanced.

The invention discloses an experiment table system for an axial flow compressor of an aero-engine, and aims to break through the bottleneck by designing single-stage test and surge simulation, so that the experiment table system can measure experiment parameters such as pressure, flow, temperature and rotating speed of the axial flow compressor. Comprising an axial flow compressor suite, a sensor suite, a PLC, an asynchronous motor, an electric control valve and an exhaust device. A driving shaft of the asynchronous motor is connected with the axial flow compressor suite; the exhaust device is located at the rear end of the axial flow compressor suite, and the electric control valve is arranged on an airflow channel of the axial flow compressor suite and the exhaust device. The sensor suite is used for detecting pressure, temperature and air flow signals of the axial flow compressor and sending the collected signals to the PLC, and the PLC sends the signals to the industrial personal computer; the industrial personal computer controls the opening degree of a throttle valve of the electric control valve through the PLC, and the flow of air flowing through the axial flow air compressor is changed. The industrial personal computer controls the rotating speed of the asynchronous motor through the frequency converter.

The invention relates to a prediction backstepping control method for a hypersonic flight vehicle. The method comprises the following steps: S1, constructing a mathematical model of the hypersonic flight vehicle; s2, decoupling the mathematical model of the hypersonic aircraft into a speed subsystem and a height subsystem; s3, taking the weighted sum of the speed tracking error and the accelerator opening degree as an optimization performance index, and solving through the speed subsystem to obtain the accelerator opening degree of the hypersonic aircraft; s4, designing a prediction backstepping controller for the height subsystem, and solving the rudder deflection angle of the hypersonic aircraft through the prediction backstepping controller by taking the weighted sum of the height tracking error and the trajectory inclination angle as an optimization performance index; and S5, the hypersonic aircraft is controlled according to the rudder deflection angle and the accelerator opening degree.

The invention relates to an intelligent control method for an automatic transmission of a commercial vehicle based on a VCU (vehicle control unit) architecture, which comprises the following steps of: based on a rule-based control mode, determining an operation mode of an AMT (automated mechanical transmission) of the vehicle according to an optimal principle according to a vehicle operation condition, a road condition and an intention of a driver, and performing intelligent switching control on economical and dynamic gear shifting rules of the transmission by the VCU, and the economic mode is selected under the condition that the accelerator opening degree is smaller than or equal to a preset threshold value under the light load or the small road slope or the uphill working condition. And selecting a power mode under the conditions of heavy load, relatively large gradient and greater accelerator opening degree than a preset value under the uphill working condition. Intelligent switching control is carried out on economical efficiency and dynamic property gear shifting rules of the transmission, it is guaranteed that an engine works in a proper rotating speed interval, and the climbing dynamic property is improved on the premise that economical efficiency is guaranteed. And meanwhile, the VCU improves the feeling of a driver on the fuel economy and the dynamic property of the vehicle through the multi-stage accelerator Map switching control method.

The invention discloses a carburetor control system, a carburetor control method and a multi-fuel engine, the control system is applied to a carburetor with a plurality of fuel gas inlet channels, and the control system comprises a fuel change-over switch, a fuel type detection circuit, a power detection module and a control module, a fuel type detection circuit outputs a corresponding fuel type signal to a control module according to the current gear of the fuel change-over switch; a current output power signal of the engine is detected through the power detection module and sent to the control module; a control module outputs a corresponding throttle valve opening degree control signal to a driving motor according to a fuel type signal and a current output power signal so as to adjust the opening degree of a throttle valve to a target opening degree; therefore, the amount of fuel gas output to the engine cylinder body by the carburetor through the plurality of fuel gas inlet channels can meet the power requirement under the current load of the engine. When the multi-fuel engine uses gas fuel, the multi-fuel engine can meet different load working conditions so as to guarantee stable operation of the multi-fuel engine.

The invention discloses a coal mine underground unmanned vehicle trajectory tracking method and system. The method comprises the steps that S1, a trajectory prediction module of an unmanned vehicle and a vehicle transverse dynamics tracking error model are established; s2, designing a transverse controller based on the vehicle transverse dynamics tracking error model, and obtaining a front wheel steering angle control instruction of the unmanned vehicle; s3, designing a longitudinal controller to obtain the expected acceleration of the unmanned vehicle; s4, establishing a longitudinal inverse dynamic model of the unmanned vehicle, inputting the expected acceleration of the unmanned vehicle, and calculating to obtain the opening degree of an accelerator or the braking pressure; and S5, the speed of the unmanned vehicle is obtained based on the accelerator opening degree or the brake pressure, the front wheel rotation angle of the unmanned vehicle is obtained based on the front wheel rotation angle control instruction of the unmanned vehicle, and unmanned vehicle trajectory tracking is completed through transverse and longitudinal combined control. According to the method, a transverse and longitudinal cooperative control strategy is provided for the real-time performance and robustness requirements of the coal mine underground complex environment for trajectory tracking control, and the accurate tracking and anti-interference capability of the vehicle speed are achieved.

The present invention discloses a pedal jamming monitoring method for identifying braking intention based on multi-source data fusion, belonging to the field of automotive braking. S1: Synchronously collect the pressure applied to the brake pedal, the displacement of the brake pedal under the applied pressure, the displacement of the accelerator pedal, and the vehicle acceleration, and obtain the current driving environment information; S2: Calculate the pedal position change rate, the pedal force change rate, the throttle opening change rate, and the relative distance ratio between the current vehicle and the vehicle in front; S3: Use a random forest to generate a preliminary identification intention; S4: Generate a final identification intention; S5: Determine whether there is jamming. By adopting the above-mentioned pedal jamming monitoring method for identifying braking intention based on multi-source data fusion, through fusing multi-source data such as brake pedal displacement, pressure, throttle state, and environmental parameters, and combining mechanisms such as dual-model decision-making, dynamic threshold adjustment, and multi-rule weighted judgment, the accuracy, real-time performance, and environmental adaptability of brake pedal jamming monitoring are significantly improved.

The invention provides an electromagnetic clutch combination control method, a power system and a medium. The electromagnetic clutch combination control method comprises the steps that the real-time current of an electromagnetic clutch, the accelerator opening degree change rate and the vehicle speed are obtained; under the condition that the vehicle meets the pre-combination condition of the electromagnetic clutch, a first target value is determined according to the number of combination failures of the electromagnetic clutch, and current with the magnitude being the first target value is applied to an electromagnetic valve of the electromagnetic clutch so as to drive the electromagnetic clutch to be combined; under the condition that the real-time current of the electromagnetic clutch is larger than or equal to the first target value, preloading torque is determined based on the accelerator opening degree change rate and the vehicle speed; and controlling the output torque of the engine according to the preloading torque. The pre-combination time is shortened while successful combination of the electromagnetic clutch is guaranteed, and the dynamic property of the whole vehicle is improved.

The invention provides a self-adaptive control method and device for a supercharging system of a natural gas engine, and belongs to the field of engines. The rotating speed, the air inlet flow, first information and the required torque gradient of the natural gas engine are obtained, whether the natural gas engine is in the low-load working condition or not is judged based on the rotating speed and the air inlet flow, and the first information comprises the accelerator opening degree change rate, the rotating speed change rate, the supercharging pressure and the load change slope; when the natural gas engine is in the low-load working condition, determining whether the current working condition is a steady-state working condition or a transient working condition according to the first information; and under the condition that the current working condition is the steady-state working condition, the opening degree of the deflation valve is controlled to be in a full-open state, under the condition that the current working condition is the transient working condition, the transient working condition is divided into multiple transient grades according to the accelerator opening degree change rate and the required torque gradient, and the opening degree of the deflation valve is controlled according to the transient grades. According to the scheme, the problem that the economical efficiency and the dynamic property of the natural gas engine under low load are difficult to balance is solved.

The present application belongs to the technical field of vehicle mass online estimation, in particular to a vehicle mass online estimation method based on fuzzy logic and weighted least square method, comprising the following steps: 1) obtaining longitudinal acceleration sensor measurement value signal, longitudinal speed signal, engine output torque signal, gear signal, throttle opening signal, brake pedal signal and steering wheel angle signal from vehicle CAN bus; 2) correcting the measurement value of longitudinal acceleration sensor; 3) calculating equivalent driving force and equivalent acceleration; 4) calculating working condition fitness degree by using fuzzy logic algorithm; 5) estimating vehicle mass by using weighted least square method; and 6) suspending and starting vehicle mass estimation. The structure is reasonable, and the accuracy and working condition adaptability of vehicle mass online estimation can be improved during use.

The invention discloses a pedal clamping stagnation monitoring method for recognizing a braking intention based on multi-source data fusion, and belongs to the field of automobile braking. S1, pressure applied to a brake pedal, displacement of the brake pedal under applied pressure, displacement of an accelerator pedal and acceleration of a whole automobile are synchronously collected, and current driving environment information is obtained; s2, the pedal position change rate, the pedal force change rate, the accelerator opening degree change rate and the relative distance ratio of the current vehicle to the front vehicle are calculated; s3, generating a preliminary recognition intention by using a random forest; s4, generating a final recognition intention; and S5, judging whether clamping stagnation exists or not. According to the pedal clamping stagnation monitoring method for identifying the braking intention based on multi-source data fusion, multi-source data such as brake pedal displacement, pressure, accelerator state and environmental parameters are fused, and mechanisms such as double-model decision, dynamic threshold adjustment and multi-rule weighted judgment are combined; accuracy, real-time performance and environmental adaptability of brake pedal clamping stagnation monitoring are remarkably improved.

The present invention discloses a method and device for controlling the excess air coefficient of a natural gas engine. The method comprises obtaining a current engine state signal, a cylinder pressure signal, and the actual excess air coefficient of the previous control cycle; determining the actual air volume based on the relationship between the current engine state signal and a signal threshold, the cylinder pressure signal, and the engine's operating state; and determining a target natural gas injection volume based on the actual air volume and the actual excess air coefficient of the previous control cycle; determining a target throttle opening based on an engine accelerator pedal signal; adjusting the target natural gas injection volume in real time based on the target natural gas injection volume, controlling natural gas combustion based on the real-time adjusted target natural gas injection volume and target throttle opening, and obtaining the actual excess air coefficient of the current control cycle in real time, ensuring that the difference between the actual excess air coefficient and the target excess air coefficient always remains within the threshold range. Using this method, precise control of the actual excess air coefficient is achieved.

The invention relates to the technical field of engines, in particular to a transient response capability testing method and device, electronic equipment and a storage medium. Acquiring an initial working condition point corresponding to the target engine; initial working condition information corresponding to the initial working condition point and the initial throttle opening degree corresponding to the initial working condition point are input into a preset transient calculation model corresponding to the target engine, the initial throttle opening degree is controlled to be changed to the target throttle opening degree within a preset time period, and first transient response performance data corresponding to the target engine are obtained; according to the first transient response performance data, whether the target engine reaches a target working condition point or not is judged; and according to the judgment result, the transient response capability corresponding to the target engine is determined. And the accuracy of the transient response capability corresponding to the determined target engine is ensured. The transient response capability of the engine can be efficiently and accurately tested, the existence period is short, and the cost is low.

The invention relates to the field of vehicle control, in particular to an intelligent oil-saving sliding control method and system for an AMT commercial vehicle and the commercial vehicle, and the method comprises the steps: obtaining a gradient threshold interval and hysteresis width corresponding to a current state based on the total load of the vehicle, the real-time vehicle speed and the real-time road gradient; whether the engine water temperature and the accelerator opening degree signal meet preset fuel-saving sliding admission conditions or not is judged in real time; when all the access conditions are met and the real-time gradient and the vehicle speed are within the threshold interval, gear combination of the AMT gearbox is maintained, an engine is controlled to enter a fuel cut-off mode, and the vehicle enters an intelligent fuel-saving sliding state based on engine reverse towing; and if the real-time gradient exceeds the safety range, engine fuel oil supply is immediately recovered, and the in-cylinder braking or exhaust braking function of the engine can be cooperatively activated, so that the fuel-saving sliding state is stably quitted. And on the premise of ensuring compliance and safety of the whole process, the fuel economy is effectively improved.

The application discloses a fuel injection control method and device, electronic equipment and storage medium. The fuel injection control method comprises the following steps: after the accelerator pedal is stepped on, determining the engine torque demand according to the current working state of the engine and the stepping amount of the accelerator pedal, and determining the required intake air amount and the required fuel amount of the engine according to the engine torque demand; determining the current throttle opening of the engine according to the required intake air amount, and after the current fuel injection pulse width of the fuel injector is determined according to the required fuel amount, controlling the throttle valve to hit the target position corresponding to the current throttle opening, and controlling the fuel injector to open to the current fuel injection pulse width; acquiring the current fuel injection rail pressure, and determining the fuel injection mass flow of the engine by querying the fuel injection mass flow calculation MAP according to the current fuel injection pulse width and the current fuel injection rail pressure; and inputting the fuel injection mass flow into the engine model to output the current air-fuel ratio. The application realizes real-time adjustment of the fuel injection mass flow.

The utility model provides an oil-electricity hybrid power control system, which is suitable for a vehicle and comprises a storage battery, an integrated starter generator coupled to the engine; the hybrid power controller is used for receiving at least one of an accelerator opening degree signal, a brake signal, an engine rotating speed signal, a storage battery voltage signal, a starting signal and an idling stop signal and determining whether to perform one of a starting mode, a charging mode, an auxiliary power judgment mode, a regenerative charging judgment mode and an idling stop judgment mode according to the at least one of the accelerator opening degree signal, the brake signal, the engine rotating speed signal, the storage battery voltage signal, the starting signal and the idling stop signal; when the hybrid power controller is in a charging mode, the integrated starter generator is driven by the engine to generate and output a first AC voltage to the hybrid power controller, so that the hybrid power controller performs switching voltage regulation control according to the first AC voltage to generate output power to charge the storage battery and the vehicle load.

The embodiment of the invention provides a vehicle demand power prediction method and device, vehicle control equipment and a hybrid vehicle. Relates to the technical field of automobiles. The method comprises the steps that the current gear, the first shaft rotating speed, the second shaft rotating speed, the current accelerator opening degree, the current road slope information and the current vehicle weight information of a target hybrid vehicle are obtained; according to the first shaft rotating speed, the second shaft rotating speed and the gear transmission information of the adopted hybrid power gearbox, the third shaft rotating speed of a driving motor on the target hybrid power vehicle is calculated; according to the first shaft rotating speed of the engine, the second shaft rotating speed of the generator and the third shaft rotating speed of the driving motor, the initial peak value demand power of the target hybrid vehicle is calculated; and according to the current accelerator opening degree, the current road slope information and the current vehicle weight information, the initial peak demanded power is corrected, and the target demanded power of the target hybrid vehicle is obtained. According to the invention, the prediction precision of the demand power is effectively improved, and the optimization target of fuel economy is realized.

The invention provides an accelerator torque self-adaptive control method, device and equipment and a storage medium, and the method comprises the steps that under the condition that the total time of driving circulation of a vehicle is larger than preset time, multiple vehicle running times corresponding to multiple opening degree intervals are determined; target vehicle running time is screened out from the multiple vehicle running time; according to the target opening degree interval corresponding to the target vehicle running time, the basic accelerator torque corresponding to the target opening degree interval is adjusted, and the target accelerator torque is obtained; constructing an accelerator torque mapping table according to the at least one target opening degree interval and at least one target accelerator torque corresponding to the at least one target opening degree interval; and when the running state of the vehicle meets the preset running state requirement, the basic accelerator torque of the vehicle with the accelerator opening degree in different opening degree intervals is adjusted through the accelerator torque mapping table. The basic accelerator torque can be adaptively adjusted according to different working conditions, and the purposes of improving driving experience and reducing oil consumption are achieved.

The invention discloses an engine multi-vehicle-type adaptive NVH quality optimization method and system, and belongs to the technical field of automobile engine debugge.The method comprises the steps that after an engine is installed on a to-be-adapted vehicle, vehicle working condition data are collected in real time, the vehicle working condition data comprises a vehicle speed, an accelerator opening degree, an engine rotating speed, a gear, a hydraulic torque converter locking state and an engine oil temperature signal; the vehicle working condition data is compared with the working condition of the engine noise sensitive working condition, and whether the engine noise sensitive working condition is entered or not is recognized; when the engine has the noise sensitive working condition, an NVH control strategy embedded in an engine electronic control unit is activated; the NVH control strategy comprises adjustment of an engine ignition angle and oil injection parameters; the engine is controlled according to the ignition angle optimization control instruction and the oil injection parameter optimization instruction; and when the vehicle runs out of the working condition of the noise sensitive working condition of the engine or gear shifting is completed, the conventional combustion control logic is recovered. And the rising rate of the pressure in the cylinder is effectively reduced, so that the structural knocking noise within the range of 150-600Hz is inhibited.

The invention provides a vehicle control method and related equipment, and the vehicle control method comprises the steps: obtaining a first gradient of a first ramp, a first accelerator opening degree of a target vehicle and a first torque value mapped by the first accelerator opening degree under the condition that a starting operation of the target vehicle on the first ramp is detected; determining a target torque value of a motor in the target vehicle according to the first gradient, the first accelerator opening degree, the first torque value and a prediction model; and controlling the motor to output torque according to the target torque value so as to enable the target vehicle to start from the first ramp. According to the method, the starting efficiency of the vehicle on the ramp is improved.

The invention relates to a motor zero-crossing control method, system and device and a medium. The method comprises the steps that the working condition of a motor is monitored; when the motor enters the zero-crossing working condition, the accelerator opening degree, the accelerator opening degree change rate, the motor rotating speed and the vehicle speed of the vehicle are obtained; according to the rotating speed of the motor and a pre-obtained inter-tooth gap, calculating zero-crossing torque withdrawal duration; according to the accelerator opening degree, the accelerator opening degree change rate and the vehicle speed, the zero-crossing torque withdrawal moment and the zero-crossing torque withdrawal torque of the motor are determined; and under the zero-crossing working condition, the motor is controlled to operate according to the zero-crossing torque withdrawal torque and the zero-crossing torque withdrawal duration at the zero-crossing torque withdrawal moment. The method is suitable for vehicles with various driving forms, and the driving smoothness and comfort can be remarkably improved.

The invention relates to the technical field of compressed air energy storage, in particular to a compressor power tracking and backpressure adjustment cooperative control method which comprises the steps that the operation mode and operation parameters of a compressor are recognized; if the operation mode is a first operation mode, the target power tracking and backpressure adjustment cooperative control mode is that the backpressure and the power of a compressor are adjusted according to the opening degree of an outlet throttle valve; if the operation mode is a second operation mode and a third operation mode, the target power tracking and backpressure adjustment cooperative control mode is that the backpressure and the power of the compressor are adjusted according to the rotating speed, the inlet guide vane angle and the opening degree of an outlet throttle valve; and the backpressure and power of the compressor are adjusted based on the target power tracking and backpressure adjustment cooperative control mode. Therefore, the problem that a single outlet throttling mode of a traditional mode is difficult to achieve wide working condition flexible regulation and control and power tracking in a large pressure ratio range in the compression link is solved.

The invention discloses a throttling valve with throttling opening controlled by an electric cylinder and a working method of the throttling valve, and relates to the technical field of pressure regulation of throttling valves. A pressing assembly for pressing a valve element downwards is arranged between a frame and a valve deck; pulling assemblies used for pulling down the valve element are arranged on the left side wall and the right side wall of the conveying pipe correspondingly, the pulling assembly located on the left side comprises a blind groove formed in the inner side wall of the conveying pipe and a nut fixedly arranged on the left side of the conveying pipe and opposite to the blind groove in the left-right direction, a pin shaft is fixedly arranged between the front wall and the rear wall of the blind groove, and an L-shaped force transmission block located in the blind groove is rotationally installed on the pin shaft; a screw is in threaded connection with the interior of the nut and extends into the blind groove, an arc-shaped end is fixedly arranged at the extending end of the screw, and the arc-shaped end and the long block of the L-shaped force transmission block are opposite in the left-right direction. The pressure regulating valve has the beneficial effects that the valve element moving in place can be prevented from continuously moving upwards, and the pressure regulating precision is higher.

The invention discloses a vehicle engine control method and device and a vehicle, belongs to the technical field of vehicle control, and aims to solve the technical problems that the pressure in an air inlet pipe of an existing engine system is rapidly increased to be very high when a user loosens an accelerator, and noise exists during pressure relief. The method comprises the steps that in response to release of an accelerator pedal of a vehicle, whether an engine is in a fuel cut-off forbidding working condition or not is judged; if yes, the throttle valve is controlled to be closed after being delayed for a first preset duration and / or closed at a preset speed, the fuel injection quantity of the engine is reduced, and the engine charges a battery; and if not, the throttle valve is controlled to increase the opening degree and / or keep the opening degree of the throttle valve to be maximum, and oil injection to the engine is stopped. According to the method, when a user loosens an accelerator, the pressure in the air inlet pipe can be stably reduced, noise generated during pressure relief is eliminated, meanwhile, redundant power generated during pressure relief can be utilized, and the fuel economy is improved while the customer experience is improved.

The invention relates to an engine low-pressure starting control method in a high-pressure oil pump fault mode, which is used for controlling the opening degree of a throttle valve and comprises the following steps of: calculating starting idle speed air quantity according to starting compensation air quantity and cooling machine compensation air quantity; the idle speed demand torque is calculated by multiplying the torque conversion coefficient of the air quantity; calculating an engine starting torque by adding an engine friction torque; calculating an expected throttle flow by multiplying the flow conversion coefficient of the torque; the initial throttle opening degree is obtained; the opening degree of the starting throttle valve is obtained according to the initial throttle valve opening degree and the opening degree of the starting throttle valve in the low-pressure mode; an oil injection mode is controlled, and a primary oil injection pulse represents a number-letter combination code through an index; and normalizing a letter part in the numeric-letter combination code by using binary numbers to generate a binary number code. Compared with the prior art, the engine is started in the fault mode, and limp home is achieved.

The invention discloses a hydrogen engine crankcase hydrogen concentration control method, and relates to the field of hydrogen engines, and the method comprises the steps: placing a hydrogen engine on a rack for testing, and obtaining a target hydrogen concentration, an actually measured hydrogen concentration and a crankcase blow-by amount; according to the target hydrogen concentration, the actually measured hydrogen concentration and the crankcase blow-by amount, the target working condition supplementary air amount is calculated; according to the target working condition supplementary air amount, a full-working-condition supplementary air amount database is generated based on the rotating speeds and loads of the different working conditions; obtaining the amount of fresh air needing to be supplemented under the current target working condition according to the full-working-condition air supplementing amount database; the air inlet pressure, the air inlet temperature and the crankcase pressure are obtained; the method comprises the following steps: calculating the opening degree of a throttle valve by combining the air inlet pressure, the air inlet temperature and the crankcase pressure, comparing the hydrogen concentration measured by a hydrogen concentration sensor according to the current target working condition with the target hydrogen concentration to obtain a hydrogen concentration deviation and generate a corrected fresh air amount, and carrying out closed-loop control on the actual crankcase hydrogen concentration by adjusting the opening degree of the throttle valve.

The embodiment of the invention provides a vehicle pushing assistance control method and device, equipment and a storage medium, and relates to the technical field of vehicles. The method comprises the following steps: acquiring vehicle state information of a vehicle; wherein the vehicle state information comprises the accelerator state of the vehicle and the running speed of the vehicle; under the condition that the accelerator state of the vehicle is an idle state, if the running speed of the vehicle is continuously increased from the first running speed to a second running speed, the second running speed exceeds a first pushing speed threshold value, and the duration is longer than a preset duration, the vehicle is controlled to enter a power-assisted pushing mode; and in the power-assisted pushing mode, a motor of the vehicle is controlled to provide first driving force consistent with the direction of the second driving speed for the vehicle through a speed loop control module, so that the vehicle is kept at the second driving speed. According to the method, the situation that sudden acceleration is caused due to the fact that the screwing opening degree of the accelerator is too large during manual assistance can be avoided, and therefore the safety of the vehicle is improved.

The invention discloses a gas engine cold start difficulty diagnosis method, system and device and a readable storage medium, and relates to the field of cold start fault detection, and the method specifically comprises the steps: determining an initial idle speed segment based on a real-time vehicle speed, a real-time engine rotation speed, a neutral gear signal and a clutch signal when the lowest environment temperature is detected to be smaller than a preset environment temperature threshold value; the initial idling segment is a working state when the vehicle is static and an engine is in an idling mode; in the initial idle speed segment, based on the maximum value of the engine rotating speed, the real-time engine rotating speed, the real-time gas rail pressure, the real-time gas rail temperature, the engine water temperature at the starting point of the initial idle speed segment, the real-time accelerator opening degree and the fault code, the cold start difficulty result of the gas engine is determined; the fault code is a corresponding fault code when the pressure of the intake manifold is smaller than a preset pressure threshold value of the intake manifold. According to the invention, specific faults of cold start difficulty can be identified efficiently and accurately.

The invention relates to a control method for an accelerator mistaken stepping prevention function, and the method comprises the steps: under the condition that the accelerator mistaken stepping prevention function of a vehicle is started, obtaining the vehicle speed, the accelerator opening degree, the accelerator opening degree change rate, the type of a collision target closest to the vehicle track, the distance collision time, the gear and the parking braking state in real time; when the vehicle speed is 0, based on the accelerator opening degree, the accelerator opening degree change rate, the distance collision time and the collision target type, a first target accelerator mistaken stepping prevention function control strategy is determined and executed; a first target accelerator mistaken stepping prevention function control strategy is adjusted according to the accelerator opening degree and the gear; when the vehicle speed meets the preset low-speed condition, based on the accelerator opening degree, the accelerator opening degree change rate and the distance collision time, a second target accelerator mistaken stepping prevention function control strategy is determined and executed; a second target accelerator mistaken stepping prevention function control strategy is adjusted according to the accelerator opening degree and the gear; and when the vehicle speed meets the preset high-speed condition, based on the distance collision time, a third target accelerator mistaken stepping prevention function control strategy is executed.

The invention discloses an automobile engine multi-mode electronic control system and a control method thereof, and particularly relates to the technical field of automobile engine multi-mode electronic control, the system comprises a sensor module, a mode switching module, an execution control module and a diagnosis module, the sensor module collects parameters such as rotating speed and air inlet pressure in real time; the mode switching module judges four working conditions of idling, cruising, accelerating and pressurizing based on threshold logic; the execution control module calls strategies such as PID (Proportion Integration Differentiation) control and EGR (Exhaust Gas Recirculation) rate calculation aiming at different modes to realize accurate adjustment of parameters such as throttle opening and boost pressure; the diagnosis module monitors faults of the sensor and the actuator in real time through voltage out-of-limit detection, position deviation comparison and temperature correlation analysis.